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1The total linear energy of colliding bodies before impact must always equal the total energy after impact.
A)True
B)False



2The vigor with which a body restores itself to its original shape after deformation is a measure of its elasticity or restitution.
A)True
B)False



3A coefficient of restitution equal to 0.5 is an indication that the collision is inelastic.
A)True
B)False



4The units for impulse are equivalent to the units for momentum.
A)True
B)False



5An object that has linear momentum also has kinetic energy.
A)True
B)False



6The foot-pound per second is a unit of linear momentum.
A)True
B)False



7An object bouncing against a floor with perfectly elastic collisions will continue to bounce at the same height.
A)True
B)False



8Momentum is a scalar quantity.
A)True
B)False



9Momentum is conserved in all collisions.
A)True
B)False



10The kilogram-meter per second is a larger unit of momentum than the slug-foot per second.
A)True
B)False



11Which of the following is not a unit of impulse?
A)Pound-second
B)Newton-second
C)Pound-hour
D)Newton-meter



12When the velocity of a body is doubled,
A)its kinetic energy is doubled
B)its momentum is doubled
C)its acceleration is doubled
D)its potential energy is doubled



13A 100-kg astronaut releases 1 g of gas from a special pistol at a speed of 50 m/s. As a result, he moves in the opposite direction at
A)5 cm/s
B)50 cm/s
C)0.5 cm/s
D)0.05 cm/s



14If a car is to gain momentum, it must
A)move rapidly
B)accelerate
C)lose inertia
D)lose weight



15The face of a golf club exerts an average force of 4000 N while it is in contact with the golf ball. If the impulse is 80 N * s, the time of contact is
A)0.2 s
B)0.02 s
C)2 s
D)0.002 s



16In a completely elastic collision, which of the following quantities need not be conserved?
A)Kinetic energy
B)Momentum
C)Mass
D)Potential energy



17Eight steel balls are suspended from equal heights by threads so that they are all in contact. If two balls are pulled away to the left and released,
A)one ball will leave from the right with twice the speed
B)two balls will leave from the right at approximately the same speed
C)either (a) or (b) might apply
D)neither (a) nor (b) applies



18A 40-kg cart moving at 3 m/s makes a head-on collision with a 20-kg cart at rest, as illustrated in Fig. 9-2. If the collision is completely inelastic, the speed with which the carts leave the impact is approximately
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A)2 m/s
B)6 m/s
C)20 m/s
D)0.2 m/s



19If the collision in Question 18 is completely elastic, the speed of the 20-kg cart after collision will be approximately
A)6 m/s
B)3 m/s
C)4 m/s
D)2 m/s



20A 10-g bullet is fired into a 2-kg block of wood suspended from a cord. If the block and bullet rise to a height of 10 cm after impact, the initial velocity of the bullet was approximately
A)2.8 m/s
B)281 m/s
C)235 m/s
D)28.1 m/s



21An elastic collision is one in which both and are conserved.



22 is the product of mass and velocity and has the metric units .



23The negative ratio of the relative velocities after impact to the relative velocities before impact is known as the .



24The product of the average force acting on a body and the time of action is called and it is equal to the of the body.



25The coefficient of restitution has a maximum value of for a perfectly impact and a minimum value of for a perfectly impact.



26If two colliding bodies stick together after impact and move off with the same velocity, the impact is said to be .



27In USCS, the unit for impulse is , and the unit for momentum is .



28When a rifle is fired, the of the bullet is the same as the recoil of the rifle.



29The square root of the ratio of the height to which a ball bounces to its original height is a measure of the .



30The vigor with which an object restores itself to its original shape after deformation is a measure of its .







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